After registering an account, every user is prompted to receive an activation email to click and activate the account.
If you have not received that email, check your bulk and spam mail within your email inbox.
If you want to resend the activation email, sign into the account with your email and password. The site will prompt you to resend the activation. If the account doesn't exist, that means that the wrong email was registered. Go back and re-register.
If the activation email was resent and you still haven't received the activation, it is possible that your email service provider has blocked the outgoing activation email, click here to learn how to whitelist the incoming email.